Deprecate clm5_1 physics with ctsm5.2.0_ only externals remain

[ekluzek]

With #2378 and ctsm5.2.0 made, we need to deprecate and eventually remove the clm5_1 physics option to CLM_PHYSICS_VERSION. We need to leave it in place until other components: CISM, CAM, and CMEPS have removed it's usage and are only using: clm4_5, clm5_0, or clm6_0.

Definiton of done:

• Remove all Clm51 tests from our testlists switch them to Clm60 (just remove if there's an existing Clm60 one)
• Remove the option in config_components.xml
• Remove the compsets in config_compsets.xml
• Changes to build-namelist to remove the option for clm5_1
• Remove mention of clm5_1 in the code
• Remove mention of clm5_1 in documentation
• ./rimport renamed file: .../lnd/clm2/paramdata/ctsm60_ciso_cwd_hr_params.c240814.nc

[ekluzek]

Issues in other components are here:

Those required before removal of clm5_1:

• Change compsets to use CLM60 rather than CLM51 CESM#248
• Change Clm tests in testlist to Clm60 CMEPS#455
• Update compsets and tests to use clm6_0, once CAM moves to ctsm5.2.0 or later tag CAM#1022

Those that merely update tests from clm5_0 to clm6_0: (so not required for removal)

• Change testlist to use Clm60 rather than Clm50 compsets mizuRoute#465
• Change Clm50 tests in the testlist to Clm60 CISM-wrapper#91

[ekluzek]

This has happened in CAM and CESM which is the biggest lift. There is only a small change to CMEPS that is required now.

[ekluzek]

In the latest ctsm5.2 tags as well as ctsm5.3.0 clm5_1 and clm6_0 are out of sync with differences in the namelist. Therefore removing clm5_1 is a bigger priority since it's now wrong.